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科目： 來源：不詳 題型：單選題

You should not go rafting ________ you know how to swim.
A．ifB．if notC．whenD．unless

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科目： 來源：不詳 題型：單選題

Don’t lose heart; __________ difficulties you are faced with will be overcome in the end.
A．howeverB．whateverC．whatD．How

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科目： 來源：不詳 題型：單選題

---- Are your family ready for rafting?
----Yes, I really want my children to experience that       they are young.
A．\B．if C．unlessD．while

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科目： 來源：不詳 題型：單選題

—My son is addicted to computer games. He is hopeless, isn't he?
—Yes, _____ he is determined to give up and start all over.
A．ifB．whenC．even ifD．unless

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科目： 來源：不詳 題型：單選題

He didn’t come to school yesterday _______ that he was ill.
A．becauseB．forC．inD．if

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科目： 來源：不詳 題型：單選題

--- Do you really think I can achieve my goal ?
--- Absolutely .___ you give up halfway .
A．IfB．UnlessC．SinceD．because

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科目： 來源：不詳 題型：單選題

I’d like to study law at university _____ my cousin prefers geography.
A．a(chǎn)sB．thoughC．ifD．while

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科目： 來源：不詳 題型：單選題

The number of private cars in urban areas should be limited ___________the number of public buses should be increased.
A．whenB．while C．unlessD．until

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科目： 來源：不詳 題型：單選題

___________Mrs Smith worked day and night, he found it difficult to make enough money to support such a large family.
A．SinceB．IfC．OnceD．Although

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科目： 來源：不詳 題型：單選題

Sorry to say it will be years _______ we really have classes here with only 25 students.
A．sinceB．that C．whenD．before

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